如果应用程序的目标是要能向外扩展，则在代码中必须避免使用这些机制。
If scaling out is targeted for an application, then you have to avoid these mechanisms in the code.
注入代码的目的通常是绕过或修改程序的最初目标功能。
The purpose of the injected code is typically to bypass or modify the originally intended functionality of the program.
第二，实际性：对于程序员来说，计划式编程方式构建了目标代码的抽象概念。
The second is practical: to programmers, the intentional method constitutes an "abstraction" of the underlying target code.
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